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How much does OCing VRAM helps?

post #1 of 4
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Hi guys,
I got a 6850 that runs default at 1100Mhz for VRAM and I wanted to squeeze some extra juice from her , some suggested ocing the VRAM clock to gain more FPS. I did a test by down clocking from 1100 to 1000. Btw, 1000 is the reference design by AMD, 1100 is factory overclocked. Anyway, after the downclocking, there was no decrease in FPS in both Crysis Warhead and Heaven 2.1, which should mean that the extra 100Mhz overclocked is useless right?
So when is VRAM overclocking needed and how much benefit does it bring? thanks
mamma mia
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mamma mia
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post #2 of 4
If you saw no increase from lowering your Vram clock, then your Core isnt using the full bandwidth, so overclock your core, then overclock the Vram to match.
    
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post #3 of 4
who ever suggested that is wrong. the way to overclock a graphics card is to overclock the ram and the gpu together. this will give you the best results. just overclocking one or the other will not help much as it will be slowed by the other anyway. a good way to overclock a graphics card is to stick to the factory settings and increase both equal. AMD would spend a fair amount of time ensuring that the balance of GPU and Ram clocks is close before releasing a card.

so starting at the 820/1100 you have, increase to 830/1110 and test for stability and artifacts. if thats fine increase to 840/1120 and test again. continue this until you get artifacts or start having system hard locks or what ever happens. then back it down to the last stable overclock setting.

then if you wish you can try increasing your overclock further by adjusting the GPU and memory independently. chances are that your errors are only caused by one part (GPU or Ram) and the other part can still go a little higher.
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post #4 of 4
Read this it helped me out a ton!!!
http://www.overclock.net/ati/633816-...r-ati-gpu.html
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